BE GAY AF AND SIMP ONE (or a few) OF THE CHARACTERS 💅 If you're already gay, then bathe yourself in more rainbows and Lars' coconut milk lol
No, but seriously, it's normally the story and/or the characters (or in some people's cases, the... intimate scenes) that makes you engrossed to it. If you can't find any interest, let alone enjoy the story, then I can't find any other explaination other than that particular VN is not for you.
But if you did enjoyed the story but don't have the same energy as we have in simping the characters, then you don't have to. Just... live in the moment, you know?
Hope this helps uwu